Divers from Yokosuka’s ship-repair facility were still inspecting the propeller Wednesday.

Tug boats pulled Antietam back into the pier on Tuesday, though they weren’t needed to pull the cruiser off the shoal where it grounded, Wilson said.

The propeller will need repair before Antietam can resume normal operations in the Asia-Pacific region.

Antietam is among 13 ships homeported at Yokosuka and one of at least seven equipped for intercepting ballistic missiles. Such ships typically operate at a high tempo and would be a critical part of defense if North Korea ever launched ballistic missiles at the U.S. or an ally.

Similar ships based on the U.S. West Coast also routinely patrol the Asia-Pacific region based on operational needs.

The Japan Coast Guard was initially notified Tuesday that Antietam had leaked oil because of engine trouble, a spokesman said. Navy officials could not confirm on Wednesday whether an engine malfunction occurred.

Navy officials declined to speculate on what led to the accident. A Navy investigating officer will have one month to determine the cause.

That said, loss of hydraulic oil can adversely affect ship control. The ship is no longer leaking oil, officials said Wednesday.

The spot where Antietam was anchoring can be treacherous while dealing with high winds and waves, sailors at Yokosuka have told Stars and Stripes. However, it is normally wide and deep enough to keep large ships off the bay’s shoals.

A high wind warning was in effect through 11 a.m. Tuesday, but winds did not appear particularly strong from the nearby shore that morning.

A Japan Coast Guard spokesman could not immediately confirm wind speed at 11 a.m. Tuesday, but a noon reading from the bay measured light winds at 10 mph, which wouldn’t normally affect a cruiser without other contributing factors.

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Capt. Joseph Carrigan is commander of the guided-missile cruiser USS Antietam, which leaked an estimated 1,100 gallons of hydraulic oil after running aground in Tokyo Bay, Tuesday, Jan. 31, 2017.COURTESY OF THE U.S. NAVY